CSCI 109 Discussion 7 (1)(1) - CSCI 109 Discussion February...

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CSCI 109 Discussion February {3,4}, 2016
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Announcements Homework 2 due Friday, March 4th Midterm 1 and Homework 1 disputes due Friday, March 4th Today’s presentation: Abstract Machines and Theory Next week: Operating Systems
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Attendance
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Agenda 1. Programming Review 2. Finite State Machines 3. Turing Machines 4. Architecture (from last week) 5. If time: Midterm/Homework questions
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Programming Review
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Example Program - Number Pyramid maxNumber = 1 currentNumber = 1 while True: while currentNumber < maxNumber: print (currentNumber) currentNumber = currentNumber + 1 maxNumber = maxNumber + 1 currentNumber = 1 What is the output? What is the complexity of this algorithm? Use ‘O’ notation 1 1 2 1 2 3 ... O(n^2)
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Example Program - Binary Search def binarySearch(vector, item): first = 0 last = len(vector)-1 found = False while first<=last and not found: midpoint = (first + last)//2 if vector[midpoint] == item: found = True else: if item < vector[midpoint]: last = midpoint-1 else: first = midpoint+1 return found This program performs a binary search on ‘vector’ looking for ‘item’ Returns true if it finds ‘item’, false
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